PHOENIX (AP) -- Officials in Arizona and Kansas are asking a federal court to require an obscure commission that oversees the federal voter registration form to allow the two states to require additional proof of citizenship.

The U.S. Supreme Court ruled in June that states can't require people using the federal form to provide additional proof in addition to the sworn statement Congress required when it passed the 1993 National Voter Registration Act.

The states are resisting, saying they'll set up separate ballots that only allow those who haven't provided additional citizenship proof to vote in federal elections covered by the high court's decision.

In the meantime, voters in Arizona, for example, are confused about their status. Elections officials are trying to reach out to the voters, hoping to confirm their citizenship.